6 Hebe

6 Hebe
Discovery A
Discoverer Karl Ludwig Hencke
Discovery date July 1, 1847
Alternate
designations
1947 JB B
Category Main belt
Orbital elements C D
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.201
Semi-major axis (a) 362.959 Gm (2.426 AU)
Perihelion (q) 289.958 Gm (1.938 AU)
Aphelion (Q) 435.960 Gm (2.914 AU)
Orbital period (P) 1380.373 d (3.78 a)
Mean orbital speed 19.12 km/s
Inclination (i) 14.765°
Longitude of the
ascending node (Ω)
138.846°
Argument of
perihelion (ω)
239.059°
Mean anomaly (M) 118.017°
Physical characteristics
Dimensions 185.2 km
Mass 6.7×1018 kg
Density 2 ? g/cm³
Surface gravity 0.0518 m/s²
Escape velocity 0.0979 km/s
Rotation period 0.3031 d1
Spectral class S-type asteroid
Absolute magnitude 5.71
Albedo 0.268 2
Mean surface
temperature
~170 K

6 Hebe (hee'-bee, Greek ‘Ήβη) is a very large Main belt asteroid. It has a bright surface and composition of nickel-iron metals and silicate rocks.


Size comparison: the first 10 asteroids profiled against Earth's Moon. Hebe is fifth from the right.

Hebe was the sixth asteroid to be discovered, on July 1, 1847. It was the second and final asteroid discovery by Karl Ludwig Hencke, who had previously found 5 Astraea. The name "Hebe" was proposed by Carl Friedrich Gauss, and refers to Hebe the Greek goddess of youth, cupbearer for the gods of Mount Olympus until she was married to Heracles, at which point she was succeeded by the Trojan prince Ganymede.

On March 5, 1977 Hebe occulted Kaffaljidhma (γ Ceti), a moderately bright 3rd magnitude star. No other observed occultations by Hebe have been reported.

As a result of that occultation, a small Hebean moon was reported by Paul D. Maley (4). It was nicknamed "Jebe" (see Heebie Jeebies). However, the discovery has not been confirmed.








Aspects

Stationary, retrograde Opposition Distance to
Earth (AU)
Maximum
brightness (mag)
Stationary, prograde Conjunction to Sun
February 26, 2005 April 13, 2005 1.94756 9.9 June 12, 2005 December 1, 2005
June 26, 2006 August 5, 2006 1.12052 7.8 September 15, 2006 May 26, 2007
December 21, 2007 February 7, 2008 1.59540 8.8 March 25, 2008 September 25, 2008
March 17, 2009 May 2, 2009 1.88760 9.9 July 1, 2009 December 25, 2009
August 27, 2010 September 22, 2010 0.97626 7.7 November 2, 2010 July 7, 2011
January 12, 2012 February 28, 2012 1.77490 9.4 April 19, 2012 October 13, 2012
April 6, 2013 May 24, 2013 1.74529 9.6 July 20, 2013 January 24, 2014
October 12, 2014 November 17, 2014 1.07073 8.1 December 31, 2014 August 5, 2015
February 1, 2016 March 17, 2016 1.89612 9.8 May 13, 2016 October 31, 2016
May 1, 2017 June 18, 2017 1.52235 9.1 August 8, 2017 March 6, 2018
November 13, 2018 December 29, 2018 1.27267 8.5 February 10, 2019 August 28, 2019
February 19, 2020 April 4, 2020 1.94859 9.9 June 2, 2020 November 20, 2020

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